If you're going to keep using the 675 lines, you should be able to use the same banjos. If you're going to use R6 or aftermarket lines, you'll probably have to get new ones. They're only about $5 each though.

Has anyone done the R6 Caliper conversion and NOT upgraded the lines and/or master cylinder???
I got my R6 Calipers today and it seems pretty clear that my stock lines are NOT going to work (Too Short). At one point I thought there might be a way to make them work if they were re-routed and the fittings on the ends could be bent, but I don't think that is the case, hence my question.
After all the trouble I have had with the stock brakes on my 09+ I would love to upgrade to a Brembo MC but there is no way I can afford it right now. If I have to buy new lines that is not only going to cost me more money but keep the bike parked even longer (and the weather here is awesome), not to mention the learning curve on ordering lines.
I'm hoping one of you can tell me that you did the switch without anything but R6 calipers and spacers (and tell me how you did it), but I'm not optimistic. :-/
I can post pictures if it's needed (and someone can tell me how to post them)

Looking to do this upgrade as well. My calipers came with sleeve guides for the caliper bolts. Have people been keeping the guides or removing them. And if they are removing them how are you going about removing them

You need to remove the sleeves from the R6 calipers. The easiest way to do this by putting them in a vise and crushing them. You will need to buy custom spacers to replace those sleeves. There should be another thread with the link to the source.
You will also need to buy new custom brake lines from Spiegler.